ATDC5 CELLS CULTURE PROBLEMS! - (Oct/10/2008 )

hI!I´m working with ATDC5 cells and i´m become crazy because the cells dye without any explanation.tHEY GROW PROPERLY BUT SUDDENLY THEY MEDIUM CHANGE TO YELLOW AND THE CELLS BECOME ELONGATED. aFTER THAT, THEY DYECan you tell me something about it?Thank you very much in advanceCecilia